Released for Game Boy in 1991 by Nintendo R&D 1.

Agonized over the decision to purchase this game - I had a catalog of Game Boy games that I must have read through a hundred times, and I finally settled on this one? How strange. This was really two games in one - GAME-A was a fancy version of battleship, and GAME-B was a submarine combat action game. Believe it or not, I liked GAME-A better. The AI was just the right challenge for me, and some of the additions really made the game a lot of fun - multi-shot powers, and a three-board campaign mode.